class_docstr: A stream operator for aggregating an entire history of a stream.
  
  Parameters
  ----------
  func : `Callable[[List[float]], float]`
      A function that aggregates the history of a stream.
code: def has_next(self):
      return True
  
imports: from typing import Callable, List
  import numpy
  from tensortrade.feed.core.base import Stream
  from tensortrade.feed.api.float import Float
label_desc: Use image node_id 3 for calling the ExpandingNode obj's underlying member method code with example usage: obj.has_next() and returns: True